Improved shaking table for separating ores



C', A.VSTETEFELDT.

I Ore Separator. No. 42,970. PatentedI May 3l, l1864.

Waan/66565 y mummy? M Y @M Mm@ 0 A `vr gli UNITED STATES PATENT OFFICE.

CHARLES A. STETEFELDT, OF NEW YORK, N. Y.

IMPROVED SHAKING TABLE FOR SEPARATING CRES.

Specification forming part of Letters Patent No. 42,970, dated May 31, 1864.

To all whom it may concern:

Be it known that I, CHARLES A. STETE FELDT, of the city, county, and State of New York, have invented a new and Improved Botating Shaking Table; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this speciiication, in which- Figure l represents a longitudinal vertical section of my invention, the line .t ai, Fig. 2, indicating the plane of section. Fig. 2 is a plan or top view of the same.

Similar letters of reference in both views indicate correspondn g parts.

This invention consists in a shaking table provided with two or more rotating beds, arranged one above the other in such a manner that by their action the pulverized ore running down over them is separated automatically by the action of the machine, according to the different specic gravities of the oonstituents, and that the separation can be continued to any desired degree simply by iucreasing the number of rotating beds. The invention consists, also, in the application of one or more rotating endless aprons placed in an inclined position in a shoe, to which a shaking motion is imparted by the action o'ta suitable cam in a direction opposite to that in which the apron or aprons move, in such a manner that by the shaking motion ot' the shoe the heaviest material contained in the ore is carried over the highest part of each apron, and by the motion ot' the apron itself the lightest parts of the ore are carried over the lowest end of said apron and deposited in a suitable receiver or trough if no other apron is used, or on the next succeeding apron if the separation is to be carried on still further.

To enable others skilled in the art to fully understand and construct my invention, l will proceed to describe it.

A represents a frame, made of wood or any other suitable material, which supports the shoe B. This shoe is suspended by means of links ay from eyebolts b, the shanks of which extend up through the cross-bars c, of the frame A, so that either end of the shoe can be raised or lowered at pleasure. The shoe B forms the bea-rings for the axles or gudgeons of the rollers d d', on which the endless aprons C C are stretched, and rollers dt, under said aprons, are intended to support that portion ruiming below the rollers d d. The apron C is situated in the upper part ot' the shoe B, close under the chute D, which receives the ore and water from the hopper E and spreads it over the entire width of said apron. A perforated pipe, c, extending across the chute l), serves to introduce jets of water for the purpose ot' washing oft' such particles of ore that are liable to stick or adhere to the surface ofthe chute, and a roller, f, is so situated that it prevents the passage of such particles of ore which may not have been reduced to the requisite state ot ineness. The shoe B is so adjusted that the apron C is in a slightly-inclined position, its highest part being nearest to the hopper, and a continuous rotary motion is imparted to itin the direction of the arrows marked near it on Fig. l by a belt passing round one of the rollers, d, or over a pulley attached to the axle of one of said rollers.

F is a cam which is secured to a shaft, g, that has its bearings in the uprights h in front of the shoe B, and to which a rotary motion is imparted by steam, water, or any other competent power. The cam F acts on a tappet, t', secured to a cross-barhj, inserted between the side boards of the shoe and near to their front ends. Springs k, which are attached to arms l, extending from the rear end of the shoe, have a tendency to force said shoe in the direction toward the hopper, and if the cam F strikes the tappet i said shoe is forced from the hopper. The several sections or wings of said cam are so shaped that they release the tappet 'i suddenly, and whenever this takcs place the springs k cause the shoe, with the aprons, to iiy suddenly in the direction of the arrow marked on the shoe in Fig. 1, or opposite to that in which the apron moves. The percussion of these repeated blows causes the heavy parts contained in the orc to ascend the apron C and to drop over its upper end into a trough, Gr, below, whereas the light parts of the ore are carried by the motion ofthe apron in the direction of the arrow marked near it, over the lowest end of the same, and are deposited either in a trough underneath, or, if the separation is to be carried on still further, upon the second apron C', which is situated below the apron C, as clearly shown in Fig. 1. By the action of this apron a second separation takes place7 and the heaviest particles of the ore deposited on said apron are by the percussion of the shaking device carried over the highest portion ofthe apron and deposited in the trough Gf, whereas the refuse is carried by the motion of the apron over the lowest end of the same and dropped into the trough H.

It is obvious that the effect produced by each apron depends in a great measure upon the speed ot said apron in proportion to the number and force of the blows caused by the shaking device. rlhe ore is separated according to the specific gravity of its constituents,

and by increasing the number of aprons the separation can be carried on to any desired degree, though in most cases one or two aprons will be sucient for all practical purposes.

Vhat I claim as new, and desire to secure by Letters Patent, is

1. The employment or use, in a shaking table, of two ore more rotating beds or aprons, arranged one above the other7 in the manner and for the purpose substantially as herein shown and described.

2. The application of one or more inclined endless rotating aprons, C C', arranged in combination with the shoe B, and with a shaking device acting in a direction opposite to that in which the apron or aprons move, substantially as and for the purpose specified.

CHARLES A. STETEFELDT.

Witnesses M. M. LIVINGs'roN, GEO. W. REED.

il l 

